Yes, well, I have the power to do a lot of things that I don't have the right to do. Waging a war of conquest is immoral, you have no right to do it, and you have no right to any land you gained from it.

And yes, that ultimately implies that all land ownership is unrightful and illegitimate. I'm with Gerrard Winstanley: private land ownership was the original sin, and communities holding land in common is the first step to redemption.

Not one war, because not one people. Many nations and tribes. Only some of it was outright war, that’s not an accurate enough description of how colonialism works.

Mostly, the people of the Americas were defrauded. Massive population crash was due to disease but also famine and displacement and disenfranchisement, and not necessarily by force. Lies were much easier.

Your reproduction of the simple Law of the Jungle myth is part of the narrative of settlers.